Yeah I really don't trust most devs outside the space to make good infra decisions at this point if these extremely common concepts like cordon and drain to you

Yeah I really don't trust most devs outside the space to make good infra decisions at this point if these extremely common concepts like cordon and drain to your average SRE is considered news worthy or worthy of being mocked to them. Just hire a SRE like you were supposed to in the first place or god help them when they actually decide they need one at their definition of "scale."